Plural of entasis; the plural form of an architectural or sculptural principle of subtle curvature.
From 'entasis' (singular) which comes from Greek 'entasis' meaning 'tension' or 'stretching', from 'enteinein' (to stretch). The plural '-es' follows Greek noun patterns.
Entasis is so subtle that most people never notice it, yet it's been intentional for 2,500 years—Greek architects knew that perfectly straight vertical lines look slightly curved to the human eye, so they added real curves to appear straight.
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